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  <title>Document</title>
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  <div id="app">
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<script type="text/x-template" id="x-btn">
    <button @click="num++">{{num}}次</button>
</script>
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      data:function(){
        return{
            num:0
        }
       },
       template:'#x-btn'
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        el:'#app'
     })
   </script>
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